#21 - Local, Could Be True

[Administrator]

Complete Question Explanation
(The complete setup for this game can be found here: lsat/viewtopic.php?t=3737)

The correct answer choice is (D)

The same logic that helped solve Question #20 would be helpful in solving Question #21. If each
center recycles exactly three kinds of material, then – thanks to the second rule – Centers 1 and 2
must recycle the same three kinds of material. This eliminates answer choices (A), (C), and (E).
In addition, if each center recycles exactly three kinds of material, our main inference tells us that
each center must recycle N, which immediately eliminates answer choice (B):

june07_game_4_#21_diagram_1.png

Hence, answer choice (D) is the correct answer to this Could Be True question.

[Arelyramirezdiaz]

Can you explain how we infer that N is everywhere?

[Robert Carroll]

Arelyramirezdiaz,

Check the Setup thread, specifically this paragraph:

1. From the contrapositive of the inference made above, if a center recycles not two but
three kinds of materials, then it would be impossible for that center not to recycle N.
So, N must be recycled at any center that recycles three kinds of materials:

Walk through the setup thread all the way from the beginning to that point, because it goes over how that inference can be made.

Robert Carroll